.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: #0f0f0f;
  color: #fff;
}

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  margin-left: 0;
  transition: margin-left 0.3s;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: #1a1a1a;
  border-bottom: 1px solid #2a2a2a;
  gap: 16px;
  position: relative;
}

.app-title {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  background: linear-gradient(135deg, #4a9eff 0%, #6b46c1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex: 1;
  text-align: center;
}

@media (max-width: 768px) {
  .app-header {
    flex-wrap: wrap;
  }

  .app-title {
    order: 1;
    width: 100%;
    margin-bottom: 8px;
  }

  .chat-history-toggle {
    order: 0;
  }
}

